Zlatan on reporters making a mistake in comparing him to Vela
Ibrahimovic - who is the second highest scorer in the league with 16 goals - scored in the eighth, 56th and 70th minutes. The 37-year-old Swedish star's first MLS hat trick came last season against Orlando City.
Ibrahimovic has six goals in four matches against LAFC in the rivalry nicknamed "El Trafico".
MLS scoring leader Carlos Vela scored both goals for LAFC in defeat which took his tally to 21 goals in 20 games. That also saw him become the fastest to reach 20 goals in a season in MLS history.